Dark Cloud? Hah! I challenge you to NOT find a good deal on that. Everywhere I've seen it has had it for under $10 - used, that is. I wouldn't be surprised if a lot of places have it sub-$10 new as well.
Dark Cloud only 100 points on Goozex, and you get 100 points free for joining along with a trade credit. I actually picked (and shortly recieved it within a week or so) as my free game. Its a CAG-approved trading site using an internal currency of "points". If you want to join, its www.goozex.com -- although using the link in my sig would be greatly appreciated. =D